FIMS Wavelength Calibration via Airglow Line Observations

• Published in: Journal of Astronomy and Space Sciences
• Main Authors: Dae-Hee Lee, Kwang-Il Seon, Jang-Hyun Park, Ho Jin, In-Soo Yuk, Uk-Won Nam, Wonyoung Han, Jae-Woo Park, Jina Lee, Kwang-Sun Ryu, Kyoung-Wook Min
• Format: Article in Journal/Newspaper
• Language: English
• Published: The Korean Space Science Society 2004
• Subjects: spectral calibration; airglow; FIMS; Astronomy; QB1-991; Geomagnetic Pole
• Online Access: https://doi.org/10.5140/JASS.2004.21.4.391; https://doaj.org/article/678e0e05a2234d6f89aa398937aeee65

Far-ultraviolet Imaging Spectrograph (FIMS) is the main payload of the Korea's first scientific micro satellite STSAT-1, which was launched at Sep. 27 2003 successfully. Major objective of FIMS is observing hot gas in the Galaxy in FUV bands to diagnose the energy flow models of the interstellar medium. Supernova remnants, molecular clouds, and Aurora emission in the geomagnetic pole regions are specific targets for pointing observation. Although the whole system was calibrated before launch, it is essential to perform on-orbit calibration for data analysis. For spectral calibration, we observed airglow lines in the atmosphere since they provide good spectral references. We identify and compare the observed airglow lines with model calculations, and correct the spectral distortion appeared in the detector system to improve the spectral resolution of the system.